Scaling out the density dependence of the $α$ relaxation in glassforming polymers

Details Scaling out the density dependence of the $α$ relaxation in glassforming polymers Scaling out the density dependence of the $α$ relaxation in glassforming polymers

2004-04-02

arxiv.org/abs/cond-mat/0404040v1

Physics

Condensed Matter

Soft Condensed Matter

8 pages, 4 figures

Scientific paper

10.1209/epl/i2004-10214-6

We show that the density and temperature dependences of the $\alpha$-relaxation time of several glassforming polymers can be described through a single scaling variable $X=e(\rho)/T$, where $e(\rho)$ is well fitted by a power law $\rho^x$, $x$ being a species-specific parameter. This implies that ``fragility'' is an intrinsic, density-independent property of a glassformer characterizing its super-Arrhenius slowing down of relaxations, and it leads us to propose a modification of the celebrated Angell plot.

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